Malignant Hemangiopericytoma

**Semantic type:** Neoplastic Process

**Definition:** An uncommon malignant neoplasm arising from pericytes. Distinction between benign and malignant hemangiopericytoma may be difficult or even impossible on morphologic grounds alone.

**Synonyms:** - HEMANGIOPERICYTOMA, MALIGNANT - Hemangiopericytoma, malignant - Malignant Hemangiopericytoma NOS - Malignant Hemangiopericytoma NOS